99778487 has 2 divisors, whose sum is σ = 99778488. Its totient is φ = 99778486.

The previous prime is 99778411. The next prime is 99778507. The reversal of 99778487 is 78487799.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99778487 - 2¹⁰ = 99777463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99778187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49889243 + 49889244.

It is an arithmetic number, because the mean of its divisors is an integer number (49889244).

Almost surely, 2^99778487 is an apocalyptic number.

99778487 is a deficient number, since it is larger than the sum of its proper divisors (1).

99778487 is an equidigital number, since it uses as much as digits as its factorization.

99778487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7112448, while the sum is 59.

The square root of 99778487 is about 9988.9182096962. The cubic root of 99778487 is about 463.8159059008.

The spelling of 99778487 in words is "ninety-nine million, seven hundred seventy-eight thousand, four hundred eighty-seven".